Originally Posted by
BLKNOTCH
I know there will be others to give different advice but I would have your friend change now to 25% as it is the persentage listed by Novarossi for it's .21 engine's, I think 20% is to low nitro content for .21 engine's as it is mainly used for .12 engine's. I am sure it is not hirting anything but I don't think it can perform as it could be with the % it was listed at. That being said I am sure the stock shimmimg for your friends engine .8 with 2 x aluminum shims and 1 x copper shim, he can bring the shims down to .7 by removing 1 of the aluminum and replacing it with a second copper but to be sure measure the shims as you can get the copper shims in .1 and .2 sizes. The aluminum shims are .3 in size.
Hope this helps
Sean
I always thought 20% worked great, but 25% is my choice for .21 engines...
Depending on when you bought that Nova bf 3 port...
If it's an 09' or earlier it should be shimmed .70 that is two alluminum thicker shims that are .30 each, and the copper .10 shim that hides in between the all shims or under the head button, and that's perfect for 20 or 25% fuel no worries....
If it's a brand new BF made in 2010 then it has two Allu. too, but with a brass .20 shim that makes it .80 that's for 30%...Look on the box or on the paperwork for the year it's made.....
It's confusing because the copper and brass shims look similar, but you can tell if you measure, which I never do, or have ever seen copper or brass JK and they should really come with an extra .10 shim in the box for those who run less than 30%, if not ask around and I'm sure someone would have one...
Should I buy a set of calipers????
I got a camber gauge and don't use that either...
I got a temp gauge and only use that on break in...
I don't even have a ruler....
I have an ice chest though.....